ASCIIFoldingFilter wrongly folds german Umlauts
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                 Key: LUCENE-3110
                 URL: https://issues.apache.org/jira/browse/LUCENE-3110
             Project: Lucene - Java
          Issue Type: Improvement
          Components: modules/analysis
    Affects Versions: 3.1
            Reporter: Michael Gaber


the german umlauts are currently mapped as follows.

Ä/ä => A/a
Ö/ö => O/o
Ü/ü => U/u

the correct mapping would be

Ä/ä => Ae/ae
Ö/ö => Oe/oe
Ü/ü => Ue/ue

so the corresponding rows in the switch statement should be moved down to the 
ae/oe/ue positions.

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